Softphone won't register with asterisk

Hi , Eveyone

Client won’t register asterisk when it behind some kind modem ADSL that NAT enable ,
secanario : Asterisk out side NAT and client on site NAT , I send the debug :

U 222.253.78.231:10039 -> x.x.x.x:5060
REGISTER sip:sip.hcmc.netnam.vn SIP/2.0…Via: SIP/2.0/UDP 222.253.78.231:30510…From: sip:605000000149@sip.hcmc.netnam.vn;tag=62fdf7589d2c4527bd9e1e2a2
0e23e8a;epid=3e728fa0b5…To: sip:605000000149@sip.hcmc.netnam.vn…Call-ID: 3ab61d22250a4bea9b3a2d8b4a2db5a1@222.253.78.231…CSeq: 2 REGISTER…Contact:
sip:222.253.78.231:30510;methods=“INVITE, MESSAGE, INFO, SUBSCRIBE, OPTIONS, BYE, CANCEL, NOTIFY, ACK, REFER”…Max-Forwards: 70…User-Agent: RTC/1.2.49
49…Event: registration…Allow-Events: presence…Content-Length: 0…

U x.x.x.x:5060 -> 222.253.78.231:10039
SIP/2.0 100 Trying…Via: SIP/2.0/UDP 222.253.78.231:30510;received=222.253.78.231…From: sip:605000000149@sip.hcmc.netnam.vn;tag=62fdf7589d2c4527bd9e1e
2a20e23e8a;epid=3e728fa0b5…To: sip:605000000149@sip.hcmc.netnam.vn…Call-ID: 3ab61d22250a4bea9b3a2d8b4a2db5a1@222.253.78.231…CSeq: 2 REGISTER…User-A
gent: Asterisk PBX…Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY…Contact: sip:605000000149@x.x.x.x…Content-Length: 0…

U x.x.x.x:5060 -> 222.253.78.231:10039
SIP/2.0 401 Unauthorized…Via: SIP/2.0/UDP 222.253.78.231:30510;received=222.253.78.231…From: sip:605000000149@sip.hcmc.netnam.vn;tag=62fdf7589d2c4527
bd9e1e2a20e23e8a;epid=3e728fa0b5…To: sip:605000000149@sip.hcmc.netnam.vn;tag=as5e8ab72e…Call-ID: 3ab61d22250a4bea9b3a2d8b4a2db5a1@222.253.78.231…CSe
q: 2 REGISTER…User-Agent: Asterisk PBX…Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY…Contact: sip:605000000149@x.x.x.x
WWW-Authenticate: Digest realm=“voip.hcmc.netnam.vn”, nonce=“0ddf6e9f”…Content-Length: 0…

U 222.253.78.231:10041 -> x.x.x.x:5060
REGISTER sip:sip.hcmc.netnam.vn SIP/2.0…Via: SIP/2.0/UDP 222.253.78.231:10774…From: sip:605000000149@sip.hcmc.netnam.vn;tag=c955a0e3fcfc416596beb37fc
edf3408;epid=1bb7a61b7f…To: sip:605000000149@sip.hcmc.netnam.vn…Call-ID: e45d91eab7fa4fa1859483edc611defd@222.253.78.231…CSeq: 1 REGISTER…Contact:
sip:222.253.78.231:10774;methods=“INVITE, MESSAGE, INFO, SUBSCRIBE, OPTIONS, BYE, CANCEL, NOTIFY, ACK, REFER”…Max-Forwards: 70…User-Agent: RTC/1.2.49
49…Event: registration…Allow-Events: presence…Content-Length: 0…

U x.x.x.x:5060 -> 222.253.78.231:10041
SIP/2.0 100 Trying…Via: SIP/2.0/UDP 222.253.78.231:10774;received=222.253.78.231…From: sip:605000000149@sip.hcmc.netnam.vn;tag=c955a0e3fcfc416596beb3
7fcedf3408;epid=1bb7a61b7f…To: sip:605000000149@sip.hcmc.netnam.vn…Call-ID: e45d91eab7fa4fa1859483edc611defd@222.253.78.231…CSeq: 1 REGISTER…User-A
gent: Asterisk PBX…Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY…Contact: sip:605000000149@x.x.x.x…Content-Length: 0…

U x.x.x.x:5060 -> 222.253.78.231:10041
SIP/2.0 401 Unauthorized…Via: SIP/2.0/UDP 222.253.78.231:10774;received=222.253.78.231…From: sip:605000000149@sip.hcmc.netnam.vn;tag=c955a0e3fcfc4165
96beb37fcedf3408;epid=1bb7a61b7f…To: sip:605000000149@sip.hcmc.netnam.vn;tag=as2312a78e…Call-ID: e45d91eab7fa4fa1859483edc611defd@222.253.78.231…CSe
q: 1 REGISTER…User-Agent: Asterisk PBX…Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY…Contact: sip:605000000149@x.x.x.x
WWW-Authenticate: Digest realm=“voip.hcmc.netnam.vn”, nonce=“6586b1cf”…Content-Length: 0…

pls help me to fix it

Best regards
nnnga@hcmc.netnam.vn